Rotary mixer for concrete.



K037112580. PATENTED JAN. 6; 1903.

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ROTARY MIXER FOR CONCRETE.

. APPLIGATION FILED AUG. 5, 1901.

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W. LJUDD. ROTARY MIXER FOR CONCRETE.

NO MODEL.

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PATENTEDJAN. 6, 190's.

W. J. 311m), I ROTARY MIXER FOB CONCRETE.

APPLICATION FILED AUG. 5, 1901.

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UNITED STATES PATENT OFFICE.

YVlLLIAM J. JUDD, OF NE'W YORK, N. Y., ASSIGNOR TO FREDERICK C.

AUSTIN, OF CHICAGO, ILLINOIS.

ROTARY MIXER FOR CONCRETE;

SPECIFICATION forming part of Letters Patent No. 717,580, dated January 6, 1903.

I Application filed August 5,1901. Seria No. 70,918. No model.)

To all whom it may concern:

Beit known that LWILLIAM J.JUD1), a citizen of the United States, residing at New York, in the county of New York and State of New York, haveinvented acertain new and useful Improvement in Rotary Mixers for Concrete and other Materials, of which the following is a specification.

Objects of my invention are to rapidly and efiectively mix together materials or ingredicuts for forming concrete and the like, to positively feed the materials through the mixer and at the same time thoroughly mix them together, to avoid clogging, to reduce friction, and thereby economize in driving power, and to provide a simple and efficient construction.

In the accompanying drawings, Figure l is a longitudinal section on a vertical central plane through a mixer for concrete and other materials embodying the principles of my invention, the rotary mixing or agitating and conveying devices being shown in elevation. Fig. 2 shows the apparatus in side elevation. Fig. 3 represents said apparatus in end elevation. Fig. 4 is a section taken transversely through the rotary drum or cylinder and rotary Y mixing or agitating and conveying means.

A indicates the rotary mixing-chamber. The drum or casing which forms such chamher is supported by antifriction-rolls B, arranged in any suitable Way, or, as illustrated, the rolls can be arranged in pairs or sets upon shafts O, which are in turn supported to turn in bearings D upon a suitable base-support.

The mixing-chamber is revolved by suitably-applied driving means, the drawings showing a driving-shaft E, provided with a belt-pulley F and also provided with a driving-gear Gr, which latter engages a rim or other gear H on the drum or casing.

The mixing-chamber is open at its receiving and delivery ends to permit the reception and discharge of materials and can be supplied with such materials from a chute or hopper I, arranged opposite its receiving end.

The mixing chamber contains a rotary mixer or agitator, which as a matter of further improvement is also made to subserve the purpose of aconveyer, whereby when the drum or casing is arranged to revolve about a longitudinal or substantially horizontal axis the rotary mixer and agitator while operating to stir together materials within the chamber will also feed such materials along the chamber. As one way of thus forming a combined rotary mixer or agitator and conveyor a rotary shaft K is extended through the chamher and provided with oblique blades or paddles L. Broadly considered, the shaft may extend along the axial line about which the chamber revolves, or it may extend along a line eccentric to such axial line, as illustrated, the latter of these two mentioned arrangements being. preferable.

The rotary agitator and conveyor is rotated in the direction in which the chamber is revolved, but at a greater rate of speed. As illustrative of means for such purpose the driving-shaft, having a gear which operates the drum or casing, may also have a smaller gear M, arranged to engage and drive a gear N, fixed upon thevshaft of the mixing and conveying device. By thus simultaneously revolving the chamber and the mixer or agitator all materials received within such chamber will be thoroughly mixed, the same being carried up the side of the chamber and then thrown back upon the revolving arms or blades, and by revolving the chamber and the mixer or agitator in the same direction, but causing the latter to revolve more rapidly than the chamber, all possibility of clogging is avoided and more rapid and thorough mixing secured. The arrangement also reduces friction, and also should too greata quantity of one ingredient be fed into the chamber it will be thoroughly mixed with materials fed in both before and after, it being observed that the progress of the materials through the chamber may be made as slow as desired by adjusting the angles of the blades. The blades or paddles illustrated form, in effect, a broken feed-worm, and this, in conjunction with their travel at a rate of speed faster than the rotary travel of the chamber, insures positive forward movement of the concrete or other material.

What I claim as my invention is 1. A machine for mixing concrete and the like, comprising an imperforate cylindric drum open at opposite ends and arranged to revolve about a horizontal axis and supported upon antifriction-rolls; a mixer and conveyer consisting of a rotary shaft extending longitudinally through the rotary drum and provided with laterally-projecting blades having faces in planes oblique to the axis of rotation of the shaft, which latter is arranged parallel with and below the axis of rotation of the drum; a rotary driving-shaft external to the drum and having its axis parallel with the axis of the rotary shaft of the mixer and conveyer; intermeshing gear-wheels respectively upon the driving-shaft and the shaft of the mixer and conveyer; and a gear-wheel secured upon the driving-shaft and engaging a ring-gear upon the rotary drum; the powertransmitting gearing between the drivingshaft and the shaft of the mixer and conveyer, and the power-transmitting gearing between the driving-shaft and the drum, being relatively formed and arranged to revolve the drum, and the mixer and conveyer in the same direction, and to drive the mixer and conveyer at a rate of speed greater than that at which the drum is driven.

2. A machine for mixing concrete and the like, comprising an imperforate cylindric drum open at opposite ends and arranged to revolve about a horizontal axis and supported upon antifriction-rolls; a mixer and conveyer consisting of a rotary shaft extending longitudinally within the drum and having blades arranged for mixing and feeding the materials forward from one to the other end of the drum, said shaft being arranged parallel with and below the axis of rotation of the drum; a rotary driving-shaft external to the d rum and having its axis parallel with the drum-axis; intermeshing gear-wheels respectively upon the driving-shaft and the shaft of the mixer and conveyer; and a gear-wheel secured upon the driving-shaft and engaging a ring-gear upon the rotary drum; the power-transmitting gearing between the driving-shaft and the shaft of the mixer and conveyer, and the power-transmitting gearing between the driving-shaft and the drum being relatively formed and arranged to revolve the drum, and the mixer and conveyer, in the same direction, and to drive the mixer and conveyer at a rate of speed greater than that at which the drum is driven.

3. In a machine for mixing concrete and the like, a rotary, imperforate, cylindric drum supported upon antifriction-rolls and having open ends respectively for receiving the materials to be mixed, and for discharging the mixed-up materials; a rotary mixer and conveyer arranged within the drum and journaled in bearings independent of and removed from the open ends of the drum; a hopper positioned to discharge into one open end of the drum at a point between the inner wall of the drum and the axis of the rotary mixer and conveyer; a rotary driving-shaft external to the drum; power-transmitting gearing connecting the driving-shaft with the drum, and power-transmitting gearing connecting the driving-shaft with the rotary mixer and conveyer and operating to drive it at a greater rate of speed than that at which the drum is driven, but in the same direction.

4. In a machine for mixing concrete, the rotary cylindric drum A open at each end and supported upon antifriction-rolls; a rotary shaft K extending through the drum and arranged under the axis about which the drum revolves,said shaft being provided with blades L; a powerdriven shaft E provided with gears G and M; a gear N on shaft L engaging the gear M; a ring-gear H on the drum engaging the gear G; and a hopper I arranged to discharge into one end of the rotary drum.

WILLIAM J. JUDD.

\Vitnesses:

WM. F. BAIL, CHRISTIAN THOMSEN. 

